Electric-arc lamp.



No. 732,182. PATENTED JUNE 3D, 1903. R. FLEMING.

ELECTRIC ARC LAMP.

APPLICATION FILED JAN. 30, 1901. 1

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No. 732,182. PATENTED JUNE 30, 1903. R. FLEMING.

ELECTRIC ARC LAMP.

APPLICATION FILED JAN. 30, 1901.

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No. 732,182. PATENTED JUNE 30, 1903.

R. FLEMING." ELECTRIC ARC LAMP.

APPLIQATIOR FILED JAN. 30, 1901. 10 MODEL. 4 SHEETS-SHEET 4.

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UNITED STATES Y Patented J'une 30, 1 903.

PATENT OFFICE.

RICHARD FLEMING, OF SWVAMPSCOTT, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEYV YORK.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of I Letters Patent N 0. 732,182, dated June 30, 1903. Application filed January 30, 1901. Serial No. 45,337. (No model.)

certain details of construction whereby the efficiency and power factor obtainable will be higher than heretofore. The lamp is of the differential type and is for use in a series circuit in connection with a constant-current transformer or reactive coil.

The principal improvements consist in spring-supports for the magnet-spools, spring connections between the armatures and connecting-rods, and a balanced rocker-arm connecting the series and shunt armatures with an adjustable weight to enable the lamp to be adjusted to the proper strength of current.

In the accompanying drawings, Figure 1 is an elevation of the lamp mechanism, showing a side view of the rocker-arm. Fig. 2 also is an elevation looking at one end of the rockerarm. Fig. 3 is a cross-section on the line 3 3, Fig. 1. Fig. 4. is a cross-section on the line at 4,Fig. 1. Fig. 5 is a diagram of the circuits.

The frame of the lamp is composed of the annular base-plate A, carrying an upright slotted carbon-tube or backbone 'B, the depending hangers C for the lower-carbon support, and the rigid suspended tripping-table D. The backbone and tripping-table are insulated, as usual, from the plate A by a disk of insulation A, placed between the plate and the foot B of the backbone. The upper end of the backbone is secured to a top plate E, which is insulated from a supporting-plate F, carrying upright studs f, to which the top cap G is fastened by screws g. An insulated suspending-link G is secured to the top cap.

Attached to the under side of the supporting-plate F are two parallel bars H, preferably cut away to clear the backbone, as shown in Fig. 4. At the middle of each bar is an outwardly-projecting arm h, from which is hung one of the double-spool electromagnets' I K. The spools are not secured directly to the arm, but each spool is fastened to one end of a flat U-shaped spring L, attached at its middle to the under side of the arm 72 The spoolsz'k are molded from composition, and their heads have on one side an ear 7c. The upper ears are secured to a thin strip of metal is, extending across both spools, while the lower ears are connected by a short piece of metal 10 The lower heads of the spools have also lateral ears 2" provided with metal extensions 2' 70 by means of which the two magnets are connected by screws 71 The four spools are thus rigidly connected with each other and spring-supported on the fiat springs L.

The electromagnet I is the series magnet, and K is the shunt-magnet. Each spool of the shunt-magnet has a fixed laminated core M,suspe'nded by ears 1%, attached to the upper head of the spool and extending down part way through the spool. Movable cores or armatu res M are provided for all the spools, composed of U shaped laminations fastened together. A fiat spring M is secured at each end to the cross-bar of each movable core, the downward flexure of the spring being limited by fixed stops m, depending from the crossbar. A connecting-rod N is attached to each spring M extending down to a pivotal connection with one end of a rocker O, pivoted at 0 on the backbone B. The preferred mode of connection is by means of a small block N, fitting between the sides of the rocker and perforated to receive the pivot-screw n. The block has an offset bored and tapped to engage the screw-threaded end of the connecting-rod, so that it can be adjusted lengthwise along the same.

The two armatures practically balance each other, and in order to be able to adjust this balancing efiect a weight P is mounted on the rocker and provided with a clamping-screw p, entering a longitudinal slot 0 in a bar 0, attached to the rocker, so that the weight can be adjusted lengthwise along the rocker on either side of the pivot 0.

At one end of the rocker is an insulated contact, preferably a plate R, clamped between plates of insulation 7' to an extension on one of the blocks N. The edge of the plate is adapted to make contact with a small flat spring R, mounted on. the insulating- (lisk A. A resistance-coil S has one terminal connected with the spring R. The resistance-coil is preferably made by wrapping or otherwise covering a metal tube 3 with insulating material, such as asbestos paper 3, and then winding bare iron wire 5 on the wrapping. A block 5 is secured to the baseplate A of the lamp, said block entering the lower end of the upright tube 8 and being attached thereto.

. An inverted dash-pot T is pivotally attached to the armature of the series magnet, cooperating with a stationary plunger T, loosely attached to an arm projecting from the backbone B.

The clutch U is connected with the rocker by a link or rod'V, which has an insulatingbushing W in its eye 0; to prevent current from escaping to the rocker.

The electrical connections are as follows: The lead from the positive main is connected with the insulated binding-post X on the top cap, which has four branch connections, branch 1 running to the short circuiting switch-arm Y, branch 2 to the shunt-magnet, branch 3 to the series magnet, and branch 4 to the resistance-coil. The series magnet is connected by wire 5 with the upper-carbon holder in the backbone B. The lower carbon is connected by wire 6 with the negative binding-post Z on the top cap, with which the switch arm Y engages when closed. The shunt-magnet is connected by wire 7 with the negative wire 6, and the insulated contact R on the rocker is connected by wire 8 with the negative wire 6.

By balancing the two armatures a strong series magnetis not required, so that the turns on the series magnet can be reduced to a minimum, thus raising the power factor and efliciency. The adjustment for current is obtained by shifting the weight P, it being possible in this Way to adjust the lamp for a circuit of one ampere above or below a normal current.

For a variation in current of .2 of an ampere above or below the normal current no change in adjustment is necessary. Moving the adjusting-weight toward the clutch-rod decreases the voltage at the arc and moving it in the opposite direction increases it, so that for greater dilferences than .2 of an ampere readjustment can be made by this means.

While the lamp is in operation the springs L M take up all vibration and insure a steady working of the feeding mechanism.

When the mechanism drops below the feeding-point, the contacts R R come together and act as an automatic cutout to switch the current through the resistance S.

It will be noted that the construction of this lamp is comparatively simple and that the few moving parts are easily accessible for repair. Practical tests show an increased efficiency over lamps of a similar type heretofore in use.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an arc-lamp, the combination with a pair of electromagnetic spools, of a U shaped fiat spring the arms of which are attached to said spools and form the sole support of the spools.

2. In an arc-lamp, the combination with a supporting-plate H having an arm h, of a U- shaped flat spring attached at its middle to said arm, and two electromagnet-spools secured to the arms of said spring supported wholly thereby.

3. In an arc-lamp, the combination with the armature of an electromagn'et, of a flat spring attached at each end to said armature, anda connecting-rod attachedto the middle of said spring.

4. In an arc-lamp, the combination with the armature of an electromagnet, of a fiat spring attached at each end to said armature, a connecting-rod attached to the spring, and fixed stops to limit the downward flexure of the spring.

5. In an arc-lamp, electromagnet-spools of molded composition having integral laterallyprojecting ears on their heads, and means for securing the ears of one spool rigidly to the ears of another.

6. In an arclamp, electromagnet-spools having laterally projecting ears on their heads, and means for fastening the ears of one spool to the corresponding ears on the other.

7. In an arc-lamp, series and shunt electromagnets, each consisting of a pair of spools, means for rigidly connecting all of said spools and a leaf-spring suspension for each pair of spools.

8. In an arc-lamp, series and shunt electromagnets each consisting of a pair of spools, rigid connections between all said spools, and a flat spring connecting each pair of spools with the supporting-plate.

9. In an arc-lamp, the combination with series and shunt magnets and the carbon-tube, of a rocker pivoted on said tube and having the magnet-armatures pivoted to it, and a weight adjustable along the side of said rocker.

10. In an arc-lamp, the combination with series and shunt magnets, of arocker to which their armatures are pi voted, a longitudinallyslotted bar on said rocker, and a weight having a clamping-screw engaging with the slot.

11. In an arc-lamp, the combination with a carbon-tube, of series and shunt magnets on In witness whereof I have hereunto set my opposite sides of the tube, a rocker pivoted hand this 28th day of January, 1901. on the tube and pivotally connected with the armatures of said magnets, means for adjust- 5 ing the balance along one side of the rocker Witnesses:

and olampingit in anyadjusted position, and DUGALD MOK. MOKILLOP, an insulated clutch-rod pivoted tosaid rocker. 1 JOHN A. MOMANUS.

RICHARD FLEMING. 

